Russian community is working on an add-on that partially translates the game into Russian. Basically the add-on includes three main files:
esoui/lang/ru_pregame.lua
esoui/lang/ru_client.lua
gamedata/lang/ru.lang
I perfectly know English, French and German are the languages supported by Zenimax Online. However, I'm talking about an add-on and they don't have any kind of support.
The question is: would an add-on like this one be legal? Could Zenimax ban player accounts because of using it?